I used the 140gr accubond with good results this past year. I've taken one bull and a couple muleys with this bullet in 270, plus numerous other animals with the 140gr accubond in 6.5 and 7mm. It has always done as advertised, good penetration with 60-70% weight retention. I like that it opens fast to start a large wound channel quickly. I've also looked at the 150gr accubond long range, have a box on the shelf but haven't experimented with them yet. The 150gr Partition is a tried and true option also. I'd prepare to shoot 400yds prone over your pack practicing for that hunt. My shots on elk have tended to be longer than on other game. Who are you booked with up there?